Centrifugal dust catcher



l 622 644' March 29,1927. c. G HAWLEY CENTRIFUGAL DUST ,CATCHER Filed May 4, 1925 of Figure 1;

Patented Mar. 29, 1927. i 1

UNITED STATES A 1 zz.644 PATENT oF fc CHARLES GILBERT HAWLEY, OF CHICAGO, ILLINOIS, ASSIGNOB TO CENTRIFIX COR- IPOBATION, OI CLEVELAND, OHIO, A CORPORATION OF OHIO.

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Application filed Kay 4,

My invention-relates to means for collecting and removing or-abstracting dust from vertical stacks, vents and the like, with particular reference to such improvements in the construction and operation of cupolas and other short stacks, wherein relatively high temperatures are maintained or are attained at intervals. The gases rising in such stacks are usually heavily burdened with dust particles (ash, coke and metal particles)- These are lost to the atmosphere, and where the value of the dust is of no account, the dust should nevertheless be removed to avoid annoyance in the surrounding territory.

The invention will be readily understood on reference to the accompanying drawings, in WlliCll-- Figure 1 is a vertical section of a centrifugal dust catcher embodying the invention;

Fi re 2 is a horizontal section thereof on the l ne 22 of Figure 1;

Fi re 3 is a like sectionon the line 33 Figure 4 is an enlarged detail takenfrom the upper part of Figure 1 and Figures 5, 6, 7 and 8 are detail views having todo with the form and means of suspension of the tuyere blades of the centrifugal element of my invention.

The structure in thisapplication is to be contrasted with those of my copending applications, and it may be at once stated that the special object of this invention-is to pro--- vide a dust catcher of comparatively light weight and one which shall be made up of few parts, all readily accessible and easy to renew. I

In the drawings, the parts 2 and 3 are the upper and lower'sections of the chimney, stack or vertical duct through which the dust. bearing gases rise. On the top of the part 2 is a.light fioor'section 4. Rising from this is a casing comprising the eylindrical portiop and the preferably conical top portion 6. The latter carries the top ring 7 which, in turn,;supports the stack section 3. The latter may stop just above the ring 7 but usually extends eonsiderabl higher as a measure ofbettering the dra t of the stack 2. From the top 7 I suspend a ring 8 which at the inside is fixed to the depending end of the stack"3. The part 3 may be the means of sus'pensionor 1t may I .tuyeres' as t be. supplemented by a number of hanger 1925. Serial No. 27,836.

bolts 9. The outer edge of the ring 8 is in the form of ratchet teeth 8" and on the straight section 8" of each tcothI rivet a short piece of angle iron 10. Obviously the edge'of the plate may be turned up, but generally it is easier to provide the raised edge by using a separate angle iron 10.

Some distance belowthe member 8 I sus pend or support a corresponding ratchet disk 11 preferably of somewhat larger diameter than the ring 8. It has corresponding ratchet teeth 11',-that is,-there are the same number of teeth 11' as teeth 8' in the ring 7 8, the difference being that they are slightly The longer due to'the increased diameter. part 11 is positioned far enough above the top of the stack section 2 to provide ample gas passages 12 at the sides, and it is preferab y supported in that position by a plurality of hollow legs 13 which rest on the floor section 4. The tops of these legs regri hery of the plate 11..

' hen employed at the top of a cupola or the like, where the temperatures run high, the part 11 is protected by a coating of fireproof material 15, suspended from the plate by suitable hanger bolts 16. 1

The centrifugal apparatus is completed by the addition of the tangentially positioned tuyere blades 17, one for each pair of ratchet teeth 8', 11'. Each tuyere blade comprises a flat piece of sheet metal which rests against ister with dust dumping holes 14 at the pethe upper and lower ratchet teeth of the parts- 8 and 11.- Eachv blade is suspended from the top ring 8 and of its own weight rests against the edge of the member 11. Most conveniently the suspension device is a simple hook 17 formed by bending down the Bolts 19, such as are shown in Figure 5,

may serve as a substitute for the hooks 17,

but are more difiicult to install. I

By reference each' blade 17 is characterized by a strengthening v tended edge 17, the latter coacting with the next blade to .form an inlet tuyere or nozzle 20. Obviousl there are as many of these here are ratchet teeth and tu ere blades. Thereby I provide a combend 17 and an ex-..

plete tuyere ring (composed of the suspended tuyere blades) which presents a pluor abutment 21 is formed.

The parts 22 represent dust disposal down pipes depending form the hollow legs 13, on the exterior of the stack 2. These usually serve to convey the collected dust to a bin or box at the base of the stack 2.

The operation of the'invention is as follows: The dust carrying gases rising through the stack 2 are deflected by the overhanging centrifugal unit and are distributed in the circumferential space 12. From thence the gases enter the tangential tuyercs 20. Immediately these thin tuyere streams or films impact upon the inner sides of ad jacent' blades and the dust is precipitated thereon. As will be apparent, the entranceof themany'tangential streams of rapidly flowing gases results in the organization of y a whirling mass of as within the circumferential wall of tuyere blades. By reason of this rapid rotation the dust is prevented from reaching the axis of the tuyere structure and is more or less rapidly worked down to the bottom 11. Sweeping around the periphery of that part the dust encounters the several holes 14 and falls into the hollow legs 13, there to be disposed of through the ture into the outlet 3'.

The structure defined is of such simplicity and low cost and so effective in its operation as to meet extensive needs and be practicable for wide application.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. The herein described apparatus comprising a stack, in combination with a casing at the top thereof, a central outlet at the top of said casing, an upright tangential tuyere comprising tuyere blades suspended from the top of said casing, a suitable tuyere bottom suspended above the top of the stack within the casing, and means for discharging the collected substances from the periphery of said bottom.

2. The herein described apparatus comprising a tuyere structure, composed of a top ratchet ring and a ratchet-like bottom,

in combination with tu ere blades suspended fromthe top rim an swinging and resting against the edge of said bottom.

In testimony whereof I have hereunto set my'hand this 3 day of April, A. D. 1925.

CHARLES GILBERT HAWLEY. 

